Malicious PDF — malware analysis report

Static analysis result for SHA-256 80528b5c0f21562c…

MALICIOUS

PDF

68.8 KB Created: 2021-05-11 02:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5f0507da9dd7560536dd0677a84bc6f SHA-1: 7da6f9acf774f6177232f16b69d8d249308e5bbe SHA-256: 80528b5c0f21562cfca190cca926868fea9a6fd021ebdfede46938a73c87ee4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be junk data, further indicating a malicious intent rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=new+sinhala+love+wadan
    • http://alexlunacoach.com/img/editor/file/6472072323.pdf
    • https://louvre.lv/res/wysiwyg/file/doduduxinoviwepawuloxar.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/728f51412e27eba07fe8b16d2df737a6/tawapibavoliwitobur.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7mrfq3tdv9m06sl16ac69fii2a/60427611398.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/12aa5f8dc3260d2d639788932d2f827e/80460144247.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/15eeaf4110862d346ebbd50315242a6f/roduga.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160772a8bd0449---37929722636.pdf
    • http://atdawnwelift.com/userfiles/file/57226279460.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc4020776---mabavalumafibeturirejo.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608b01361052f---82194278520.pdf
    • https://airflow-skateboards.com/upload/file/xijaso.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0c486540426fd8b72beae80ff45788fe/zowonaramalaw.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098361b60ba0---manuw.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d2234f0f80fe95cbfb8c4439c1ced592/95224585210.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3a0.bin
5689914161a1116188694d1df458d8714fe918842cd932ac18fdaa92e0e41840		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A0 4648 bytes
font_01_sfnt_off0000d36b.bin
9526e226eb088eede25b0dd84fac9023b3d8b9178c3244e82d28bfee88bbbf89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 10532 bytes
font_02_sfnt_off0000f6f4.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 4324 bytes

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